Lennox XP17-024-230-07, XP17-024-230-03, XP17-030-230-01, XP17-030-230-02, XP17-024-230-04 Installation And Service Procedure

...

INSTALLATION AND SERVICE

PROCEDURE

Service Literature

XP17 (HFC-410A) SERIES UNITS

Revised December 2013

NOTICE

A thermostat is not included and must be ordered separately.

 A Lennox iComfort-enabled thermostat must be

used in communicating applications.

 In non-communicating applications, the Lennox

ComfortSense as other non-communicating thermostats.

In all cases, setup is critical to ensure proper system operation.

Field wiring examples for non-communicating applications begin on page 61.

See the iComfort-enabled thermostat Quick Start Guide for communicating and partial communicating field wiring connections.

7000 thermostat may be used, as well

Corp. 1023-L3

TABLE OF CONTENTS

I. OVERVIEW

Model Number Identification 2....................

Typical Serial Number Identification 2..............

Specifications 2.................................

Electrical Data 3................................

Unit Dimensions 4..............................

Typical Unit Parts Arrangement 5.................

Operating Gauge Set and Service Valves 6.........

II. SYSTEM OPERATION AND SERVICE

Jumpers, Loop and Terminals (101797-XX) 8.......

System Operations 10............................

System Status, Fault and Lockout LED Codes 14....

Component Field Configuration and

Troubleshooting 19...............................

Jumpers and Links (103369-01 and -02) 26.........

Jumpers and Links (103369-03) 27.................

Configuring Unit 28...............................

7-Segment Alert and System Status Codes 31.......

Reconfiguring Outdoor Control using iComfort

-enabled Thermostat 37...........................

Routine Maintenance 37..........................

SunSource Sound Cover (SR1) Disassembly and Assembly 38..

Start-Up and Performance Checklist 40.............

Unit Wiring Diagrams 41..........................

Factory Wiring Diagrams 45.......................

Load Shed Wiring 49.............................

Unit Sequence of Operations 52...................

III. INSTALLATION

Home Energy System 38..............

XP17

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property.

Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency.

Accessories

For update-to-date information, see any of the following publications:

 Lennox XP17 Product Specification Bulletin (EHB)

 Lennox Product Catalog

 Lennox Price Book

Page 1

Unit Placement 57...............................

Removing and Installing Panels 60.................

Electrical 61.....................................

Field Control Wiring 63...........................

New or Replacement Line Set 65..................

Flushing the System 70...........................

Brazing Connections 67...........................

Leak Testing the System 72.......................

Evacuating the System 72.........................

IV. SYSTEM CHARGE

Servicing Unit Delivered Void of Charge 76..........

Unit Start-Up 76.................................

System Refrigerant 76...........................

APPENDIX A - UNIT CHARGING STICKERS

2013 Lennox Industries Inc.

Model Number Identification

I. OVERVIEW

P 17 036− −

X 2−

Refrigerant Type

X = R-410A

Unit Type

P = Heat Pump Outdoor Unit

Series

Typical Serial Number Identification

Location Code

19 = Saltillo, Mexico

58 = Marshalltown, IA

Year Code

08 = 2008 09 = 2009 10 = 2010

8 09 C

230

Minor Revision Number

Voltage

230 = 208/230V-1ph-60hz

Nominal Cooling Capacity

024 = 2 tons 030 = 2.5 tons 036 = 3 tons 042 = 3.5 tons 048 = 4 tons 060 = 5 tons

05716

5 (or 6) Digit Unique Number

Month Code

A = January B = February C = March

Specifications

Unit Outdoor Fan

Model Number

XP17-024-230-01, -02, -03, -04, -05 62 10 lbs. 0 oz. 5 26.2

XP17-024-230-06. -07 63 10 lbs. 0 oz. 5 26.2

XP17-024-230-08 63 9 lbs. 10 oz. 5 26.2

Model Number

XP17-030-230-01, -02, -03, -04, -05, -06,

-07

XP17-030-230-08, -09 67 9 lbs. 12 oz. 5 26.2

Model Number

XP17-036-230-01, -02, -03, -04, -05 70 10 lbs. 2 oz. 5 26.2

XP17-036-230-07 71 10 lbs. 2 oz. 5 26.2

XP17-036-230-08 71 9 lbs. 12 oz. 5 26.2

Model Number

XP17-042-230-01, -02, -03, -04, -05, -06 71 11 lbs. 0 oz. 5 26.2

XP17-042-230-07 72 11 lbs. 0 oz. 5 26.2

XP17-042-230-08 72 10 lbs. 10 oz. 5 26.2

XP17

Sound Rating Number

(dB)

67 10 lbs. 2 oz. 5 26.2

(dB)

Factory Refrigerant

Unit Outdoor Fan

Factory Refrigerant

Unit Outdoor Fan

Factory Refrigerant

Unit Outdoor Fan

Factory Refrigerant

Charge

Number of Blades Diameter - inches.

Page 2

Unit Outdoor Fan

Model Number

Sound Rating Number

(dB)

Factory Refrigerant

Charge

Number of Blades Diameter - inches.

XP17-048-230-01, -02, -03, -04, 05, -06 71 14 lbs. 0 oz. 5 26.2

XP17-048-230-07 73 14 lbs. 0 oz. 5 26.2

XP17-048-230-08 73 13 lbs. 10 oz. 5 26.2

Unit Outdoor Fan

Model Number

XP17-060-230-01, -02, -03, -04, 05, -06,

-07

Sound Rating Number

(dB)

73 14 lbs. 8 oz. 5 26.2

Factory Refrigerant

Charge

Number of Blades Diameter - inches.

XP17-060-230-08 73 14 lbs. 2 oz. 5 26.2

Tested according to AHRI Standard 270-2008 test conditions.

Refrigerant charge sufficient for 15 feet length of refrigerant lines.

Electrical Data

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Model Number

XP17-024-230-01, -02,

-03, -04

XP17-024-230-05, -06,

-07. -08

Maximum Over-

current Protection

(amps)

30 18.9 13.5 58.3 1/3 400 2.0

30 20.0 13.5 58.3 1/3 400 2.0

Minimum

Circuity

Ampacity

Rated Load

Amps (RLA)

Locked

Rotor Amps

(LRA)

Motor HP Nominal RPM

Full Load

Amps (FLA)

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Model Number

XP17-030-230-01, -02,

-03, -04

Maximum Over-

current Protection

(amps)

30 19.6 14.1 73.0 1/3 450 2.0

Minimum

Circuity

Ampacity

Rated Load

Amps (RLA)

Locked

Rotor Amps

(LRA)

Motor HP Nominal RPM

Full Load

Amps (FLA)

XP17-030-230-05, -06 30 20.0 14.1 73.0 1/3 450 2.0

XP17-030-230-07 30 20.4 14.1 73.0 1/3 450 2.0

XP17-030-230-08, -09 30 20.0 14.1 73.0 1/3 450 2.0

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Model Number

XP17-036-230-01, -02,

-03, -04, -05, -07, -08

Maximum Over-

current Protection

(amps)

35 22.9 16.7 79.0 1/3 600 2.0

Minimum

Circuity

Ampacity

Rated Load

Amps (RLA)

Locked

Rotor Amps

(LRA)

Motor HP Nominal RPM

Full Load

Amps (FLA)

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Model Number

XP17-042-230-01, -02, 03, -04, -05, -07, -07,

-08

Maximum Over-

current Protection

(amps)

40 24.4 17.9 107.0 1/3 600 2.0

Minimum

Circuity

Ampacity

Rated Load

Amps (RLA)

Locked

Rotor Amps

(LRA)

Motor HP Nominal RPM

Full Load

Amps (FLA)

Model Number

XP17-048-230-01, -02,

-03, -04, -05, -06, -07,

-08

Maximum Over-

current Protection

(amps)

50 29.3 21.8 117.0 1/3 675 2.0

XP17

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Minimum

Circuity

Ampacity

Rated Load

Amps (RLA)

Locked

Rotor Amps

(LRA)

Motor HP Nominal RPM

Page 3

Full Load

Amps (FLA)

208/230V-60 Hz-1 Ph

Unit Compressor Condenser Fan

Model Number

XP17-060-230-01, -02,

-03, -04, -05, -06, -07,

-08

HACR type circuit breaker or fuse.

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

Maximum Over-

current Protection

(amps)

60 35.0 26.4 134.0 1/3 675 2.0

Minimum

Circuity

Ampacity

Rated Load

Amps (RLA)

Locked

Rotor Amps

(LRA)

Motor HP Nominal RPM

Unit Dimensions -- Inches (Millimeters)

Full Load

Amps (FLA)

39-1/2 (1003)

DISCHARGE AIR

ELECTRICAL INLETS

37 (940) [-024 THRU -042] 47

(1194) [-048 AND -060]

VAPOR LINE INLET

LIQUID LINE INLET

4-7/16

18-1/2

(470)

(113)

8 (203)

1 (25)

SIDE VIEW ACCESS VIEW

UNIT SUPPORT FEET

35-1/2

(902)

16-7/8

(429)

8-3/4 (222)

3-1/8

(79)

XP17

30-3/4

(781)

BASE WITH ELONGATED LEGS

Page 4

26-7/8

(683)

3-3/4 (95)

4-5/8 (117)

Typical Unit Parts Arrangement

WIRE TIE

OUTDOOR AMBIENT

TEMPERATURE SENSOR (RT13)

SLEEVE

SECOND GROUND LUG FOR SOURCESOURCE

CONTACTOR-1POLE (K1-1)

HIGH VOLTAGE FIELD

DISCHARGE

LINE

CONNECTIONS

CONTROL (A175)

GROUND LUG

HEAT PUMP

EXTERNAL SURGE

PROTECTION USED ON

XP17-XXX-230-01 AND -02

ONLY). LATER VERSIONS INCORPORATE FEATURE

INTO FAN MOTOR.

COMPRESSOR

FAN MOTOR CONTROL (A177)

CONTROL BOX

RT21 — MODELS

-024, - 030, -036 AND -042 (12 TUBES UP)

CAPACITOR (C12)

REVERSING

VALV E

REVERSING

VALV E

SOLENOID (L1)

VAPOR VALVE

AND GAUGE

PORT

TRUE SUCTION

LINE PORT

LIQUID VALVE AND

GAUGE PORT

LIQUID LINE

BI-FLOW FILTER

DRIER

MUFFLER

LOW PRESSURE SWITCH (S87)

TRUE SUCTION LINE

CHECK EXPANSION VALV E

HR1 CRANKCASE HEATER

CRANKCASE HEATER THERMOSTAT (S40)

HIGH PRESSURE SWITCH (S4)

MODELS -048

AND -060

24 TUBES UP

XP17

Figure 1. Typical Parts Arrangement

Page 5

IMPORTANT

This unit must be matched with an indoor coil as specified in Lennox' Product Specification bulletin. Coils previously charged with HCFC-22 must be flushed.

WARNING

This product and/or the indoor unit it is matched with may contain fiberglass wool.

Disturbing the insulation during installation, maintenance, or repair will expose you to fiberglass wool dust. Breathing this may cause lung cancer. (Fiberglass wool is known to the State of California to cause cancer.)

Fiberglass wool may also cause respiratory, skin, and eye irritation.

To reduce exposure to this substance or for further information, consult material safety data sheets available from address shown below, or contact your supervisor.

Lennox Industries Inc. P.O. Box 799900 Dallas, TX 75379-9900

Operating Gauge Set

These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities who have jurisdiction before installation.

TORQUE REQUIREMENTS

When servicing or repairing HVAC components, ensure the fasteners are appropriately tightened. Table 1 lists torque values for fasteners.

IMPORTANT

Only use Allen wrenches of sufficient hardness (50Rc Rockwell Harness Scale minimum). Fully insert the wrench into the valve stem recess.

Service valve stems are factory-torqued (from 9 ft-lbs for small valves, to 25 ft-lbs for large valves) to prevent refrigerant loss during shipping and handling. Using an Allen wrench rated at less than 50Rc risks rounding or breaking off the wrench, or stripping the valve stem recess.

See the Lennox Service and Application Notes #C-08-1 for further details and information.

CAUTION

Physical contact with metal edges and corners while applying excessive force or rapid motion can result in personal injury. Be aware of, and use caution when working nearby these areas during installation or while servicing this equipment.

IMPORTANT

The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HCFCs AND HFCs) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance.

WARNING

Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and local codes.

Line voltage is present at all components when unit is not in operation on units with single‐pole contactors. Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power supplies.

The XP17 is a high efficiency residential split-system heat pump unit, which features a one stage scroll compressor and HFC-410A refrigerant. Units are available in 2, 2.5, 3,

3.5, 4 and 5-ton sizes. The series is designed for use with an expansion valve only (approved for use with HFC-410A) in the indoor unit.

XP17

IMPORTANT

To prevent stripping of the various caps used, the appropriately sized wrench should be used and fitted snugly over the cap before tightening.

Table 1. Torque Requirements

Parts Recommended Torque

Service valve cap 8 ft.- lb. 11 NM

Sheet metal screws 16 in.- lb. 2 NM

Machine screws #10 28 in.- lb. 3 NM

Compressor bolts 90 in.- lb. 10 NM

Gauge port seal cap 8 ft.- lb. 11 NM

USING MANIFOLD GAUGE SET

When checking the system charge, only use a manifold gauge set that features low loss anti-blow back fittings.

Manifold gauge set used with HFC-410A refrigerant systems must be capable of handling the higher system operating pressures. The gauges should be rated for use with pressures of 0 - 800 psig on the high side and a low side of 30” vacuum to 250 psig with dampened speed to 500 psi. Gauge hoses must be rated for use at up to 800 psig of pressure with a 4000 psig burst rating.

OPERATING SERVICE VALVES

The liquid and vapor line service valves are used for removing refrigerant, flushing, leak testing, evacuating, checking charge and charging.

Each valve is equipped with a service port which has a factory-installed valve stem. Figure 2 provides information on how to access and operating both angle and ball service valves.

Page 6

SERVICE VALVES

ANGLE AND BALL

Operating Angle Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

2. Use a service wrench with a hex-head extension (3/16” for liquid line valve sizes and 5/16” for vapor line valve sizes) to back the stem out counterclockwise as far as it will go.

SERVICE PORT CAP

SERVICE PORT CORE

(VALVE STEM SHOWN CLOSED) INSERT HEX WRENCH HERE

TO INDOOR

UNIT

(VALVE STEM SHOWN OPEN) INSERT HEX WRENCH HERE

STEM CAP

TO OUTDOOR UNIT

ANGLE-TYPE SERVICE VALVE

(BACK-SEATED OPENED)

When service valve is OPEN, the service port is open to linE set, indoor and outdoor unit.

Operating Ball Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

2. Use an appropriately sized wrenched to open. To open valve, rotate stem counterclockwise 90°. To close, rotate stem clockwise 90°.

TO INDOOR UNIT

TO OPEN ROTATE STEM COUNTERCLOCKWISE 90°.

TO CLOSE ROTATE STEM CLOCKWISE 90°.

SERVICE PORT

CORE

CAP

TO OUTDOOR

UNIT

BALL (SHOWN CLOSED)

VALV E STEM

STEM CAP

ANGLE-TYPE SERVICE VALVE

(FRONT-SEATED CLOSED)

WHEN SERVICE VALV E IS CLOSED, THE SERVICE PORT IS OPEN

TO THE LINE SET AND INDOOR UNIT.

To Access Service Port:

A service port cap protects the service port core from contamination and serves as the primary leak seal.

1. Remove service port cap with an appropriately sized wrench.

2. Connect gauge set to service port.

3. When testing is completed, replace service port cap and tighten as follows:

 With torque wrench: Finger tighten and

torque cap per table 1.

 Without torque wrench: Finger tighten and

use an appropriately sized wrench to turn an additional 1/6 turn clockwise.

Reinstall Stem Cap:

Stem cap protects the valve stem from damage and serves as the primary seal. Replace the stem cap and tighten as follows:

 With Torque Wrench: Finger tighten and then

torque cap per table 1.

 Without Torque Wrench: Finger tighten and

use an appropriately sized wrench to turn an additional 1/12 turn clockwise.

1/6 TURN

1/12 TURN

NOTE — A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.

XP17

Figure 2. Angle and Ball Service Valves

Page 7

II. SYSTEM OPERATION AND SERVICE

Jumpers, Loops and Terminals (101797-XX)

HEAT PUMP CONTROL — ONE STAGE

DS11 and DS14

LED ALERT CODES

*30

SECOND DELAY

DS13 and DS15

LED ALERT CODES

E47

100

DEGREE TARGET

100

90 DEGREE TARGET

100

E37

COMPRESSOR SHIFT DELAY

E33

FIELD TEST

DEFROST TERMINATION TEMPERATURE

FOR HUMIDITROL — ENHANCED DEHUMIDIFICATION ACCESSORY (EDA) APPLICATIONS.

Figure 3. Jumpers, Loop and Terminals (101792-xx)

70 DEGREE TARGET

*50 DEGREE TARGET

100

XP17

Page 8

Table 2. Heat Pump Control (A175) Jumper and Terminal Descriptions

Board ID Label Description

E12 PSC Fan 240 VAC output connection for outdoor fan.

E16 PSC Fan 240 VAC input connection for outdoor fan.

W 24VAC output for defrost auxiliary heat output.

L Thermostat service light connection.

Y2 24VAC thermostat input/output for second stage operation of the unit.

Y1 24VAC thermostat input for first stage operation of the unit.

O 24VAC thermostat input for reversing valve operation

E18

E19 and E20 O OUT 24 VAC output connection for reversing valve.

E21 and E22 LO-PS Connection for low-pressure switch (2.4 milliamps @ 18VAC)

E31 and E32 Y1 OUT 24 VAC common output, switched for enabling compressor contactor.

E24 and E25 HS-PS S87 connection for high-pressure switch (E25) and 24VAC (E24) to A177 “R” input.

E26 FAN 1 First Stage and second stage basic and precision dehumidification ECM fan motor 24VDC output connection 1.

E27 FAN 2 Second stage basic and precision dehumidification ECM fan motor 24VDC output connection 2.

E28 FAN C ECM common connection for ECM fan.

E30

E33 Field Test

E37

E47

W1 Short DS To R Cut for Humiditrol — Enhanced Dehumidification Accessory (EDA) applications.

* Factory default setting

DS Humiditrol Input

C 24VAC system common (Build -02 or later)

R 24VAC system power input (Build -02 or later)

Six position square pin header. P4 provides connections for the temperature sensors.

DIS (YELLOW)

AMB (BLACK)

COIL (BROWN)

Comp Shift Delay

50*

100

Input/Output - RSBus data low. Used in communicating mode only with compatible indoor thermostat. (Build -02

or later)

Input/Output - RSBus data high. Used in communicating mode only with compatible indoor thermostat. (Build

-02 or later)

Not Used

AMB 1 — Outdoor ambient temperature sensor supply.

AMB 2 — Outdoor ambient temperature return.

Range is -40ºF to +140ºF

COIL 1 — Outdoor coil temperature sensor supply.

COIL 2 — Outdoor coil temperature sensor return

This jumper allows service personnel to defeat the timed off control, initiate or terminate a defrost and field programming of unit capacity feature.

The heat pump control has a field-selectable function to reduce occasional sounds that may occur while the unit is cycling in and out of the defrost mode. When a jumper is installed on the DELAY pins (E37), the compressor will be cycled off for 30 seconds going in and out of the defrost mode. Units are shipped with jumper installed on DELAY pins. If no jumper is installed, the 30 second compressor shift delay is not active.

Seven position square pin header. E47 provides selection of the defrost terminate temperature based on the posi tion of the selection jumper. The defrost termination temperature is measured by the defrost coil sensor. The jumper termination pin is factory set at 50°F (10°C). If the temperature jumper is not installed, the default termina tion temperature is 90°F (32°C). In addition, it provides selection points for enabling the field test mode.

XP17

Page 9

System Operations

IMPORTANT

Some scroll compressor have internal vacuum protector that will unload scrolls when suction pressure goes below 20 psig. A hissing sound will be heard when the compressor is running unloaded. Protector will reset when low pressure in system is raised above 40 psig. DO NOT REPLACE COMPRESSOR.

The heat pump control (A175) provides the following functions:

 Demand defrost algorithm

 Field-selectable defrost termination temperatures

 Internal switching of outputs  Compressor anti-short-cycle delay.  Five strikes lockout safety function  High (S4) and low (S87) pressure switches

 Ambient (RT13), and coil temperatures (RT21)

temperature monitoring and protection.

COMPRESSOR ANTI-SHORT CYCLE DELAY

The heat pump control protects the compressor from:

 Short cycling (five minutes) when there is initial power

 Interruption in power to the unit  Pressure or sensor trips  Delay after Y1 demand is removed.

In non-communicating systems the delay is set for 300 seconds (five minutes) and can not be changed. To override timer when active or inactive, place a jumper on the field test pins between 1 and 2 seconds.

In communicating system, the iComfort-enabled thermostat has a separate built-in 5-minute non-adjustable short cycle protection.

Resetting Anti-Short Cycle Delay

The FIELD TEST pins (E33) on the heat pump control can be jumpered between 1 to 2 seconds to bypass delay.

HIGH (S4) AND LOW (S87) PRESSURE SWITCHES

The unit's pressure switches (LO PS - S87 and HI PS - S4) are factory-wired into the heat pump control on the LO-PS and HI-PS terminals, respectively.

Low Pressure Switch (LO-PS) — See figure 30 for low pressure switch sequence of operation.

High Pressure Switch (HI-PS) — See figure 31 for high pressure switch sequence of operation.

Pressure Switch Event Settings

The following pressures are the auto reset event value triggers for low and high pressure thresholds:

 High Pressure (auto reset) - trip at 590 psig; reset at

418.

 Low Pressure (auto reset) - trip at 25 psig; reset at 40.

COMPRESSOR PROTECTION — FIVE-STRIKE LOCKOUT SAFETY FUNCTION

The five-strike lockout safety function is designed to protect the unit's compressor from damage. The five-strike feature is used for high pressure (S4) and low (S87) pressure switch trips and W input fault or miswire.

Resetting Five-Strike Lockout

Once the condition has been rectified, power to the heat pump control's R terminal must be cycled OFF, or a jumper placed on the FIELD TEST pins between 1- to 2-seconds to reset the heat pump control.

Defrost System

The heat pump control (A175) measures differential temperatures to detect when the system is performing poorly because of ice build-up on the outdoor coil. The controller self-calibrates (see figure 32) when the defrost system starts and after each system defrost cycle. The heat pump control monitors ambient temperature, outdoor coil temperature, and total run-time to determine when a defrost cycle is required. The coil temperature sensor is designed with a spring clip to allow mounting to the outside coil tubing. The location of the coil sensor is important for proper defrost operation (see figure 1 for location of coil sensor).

NOTE - The heat pump control accurately measures the performance of the system as frost accumulates on the outdoor coil. This typically will translate into longer running time between defrost cycles as more frost accumulates on the outdoor coil before the heat pump control initiates defrost cycles.

DEFROST OPERATING MODES

The heat pump control board has three operational modes which are:

 Defrost calibration and operation (see figure 32)  Defrost test (see figure 7)

DEFROST TERMINATION TEMPERATURES (E47)

The heat pump control selections are: 50, 70, 90, and 100°F (10, 21, 32 and 38°C). The jumper termination pin is factory set at 50°F (10°C).

If the temperature jumper is not installed, the default termination temperature is 90°F (32°C). See figure 32 for on how this settings affects defrost calibration and defrost modes.

NOTE - Colder climates could require a high discharge termination temperature setting to maintain a clear coil.

IF JUMPER IS NOT INSTALLED (90ºF)

FACTORY DEFAULT (50ºF)

100

DEGREE TARGET

70 DEGREE TARGET

100

90 DEGREE TARGET

DEGREE TARGET

100

Figure 4. Defrost Termination Temperature Settings

XP17

Page 10

UNIT SENSORS

Sensors connect to the heat pump control through a field‐replaceable harness assembly that plugs into the control. Through the sensors, the heat pump control detects outdoor ambient and coil temperature fault conditions. As the detected temperature changes, the resistance across the sensor changes. table 4 shows how the resistance varies as the temperature changes for both type of sensors. Sensor resistance values can be checked by ohming across pins shown in table 3.

Table 3. Sensor Temperature / Resistance Range

Sensor

Outdoor (Ambient)

Coil

NOTE — Sensor resistance decreases as sensed temperature increases (see table 4).

Temperature Range °F (°C)

-40 (-40) to 140 (60)

Resistance values range (ohms)

280,000 to 3750

Pins/Wire Color

3 and 4 (Black)

5 and 6 (Brown)

NOTE — When checking the ohms across a sensor, be aware that a sensor showing a resistance value that is not within the range shown in table 3, may be performing as designed. However, if a shorted or open circuit is detected, then the sensor may be faulty and the sensor harness will need to be replaced.

Ambient Temperature Sensor (RT13)

See table 3 for sensor range. If the ambient sensor is detected as being open, shorted or out of the temperature range of the sensor, the heat pump control will not perform demand defrost operation. The heat pump control will revert to time/temperature defrost operation and will display the appropriate alert code. Heating and cooling operation will be allowed in this fault condition.

Coil Temperature Sensor (RT21)

See table 3 for sensor range. If the defrost coil sensor is open, shorted or out of the temperature range of the sensor, the heat pump control will not perform demand or time/temperature defrost operation and will display the appropriate fault code. Heating and cooling operation will be allowed in this fault condition.

High Discharge Line Temperature Sensor

This model does not use a high discharge line temperature sensor. The cable assembly attached to the heat pump control's E30 connection has a 10K resister installed between pins 1 and 2 as illustrated in figure 5. No alerts or alarms would be generated if resistor is damage.

COIL TEMPERA

TURE SENSOR

AMBIENT AIR

TEMPERATURE SENSOR

10K RESISTOR

Figure 5. 10k Resistor Location

W Input Fault or Miswire

In case of a W input fault or possible miswire, the system will function as listed in the sequence of operation in figure

33.

Shift Delay (E37)

*30

SECOND DELAY

Figure 6. Shift Delay Settings

THERMAL PROTECTION SWITCH (S173) COMPRESSOR MOUNTED

Some units are equipped with a compressor mounted normally closed temperature switch that prevents compressor damage due to overheating caused by internal friction. The switch is located on top of the compressor casing. This switch senses the compressor casing temperature and opens at 239-257°F (115°C-125°C) to shut off compressor operation. The auto-reset switch closes when the compressor casing temperature falls to 151-187°F (66°C-86°C), and the compressor is re-energized. This single-pole, single-throw (SPST) bi-metallic switch is wired in series with the 24V Y input signal to control compressor operation.

FACTORY DEFAULT OR WHEN JUMPER IS MISSING

XP17

Page 11

MULTI-FUNCTION TEST PINS (E33)

Placing the jumper on the field test pins (E33) using a specific sequence allows the technician to:

 Clear short cycle lockout  Clear five-strike fault lockout  Cycle the unit in and out of defrost mode  Manually place the unit in defrost mode to clear the coil

When Y1 is energized and 24V power is being applied to the heat pump control (A175), a test cycle can be initiated by placing a jumper on the heat pump control's TEST pins for 2 to 5 seconds. If the jumper remains on the TEST pins (E33) for longer than five seconds, the heat pump control will ignore the jumpered TEST pins and revert to normal operation.

The heat pump control will initiate one test event each time a jumper is placed on the TEST pins. For each TEST the jumper must be removed for at least one second and then reapplied.

Y1 Active

Place a jumper on TEST pins for

longer than one second but less than two seconds.

Clears any short cycle lockout and five strike fault lockout function, if applicable. No other functions will be executed and unit will continue in the mode it was operating.

If in COOLING Mode

No further test mode operation will be executed until the jumper is removed from the TEST pins and reapplied.

Place a jumper on TEST pins for

more than two seconds.

Clears any short cycle lockout and five strike fault lockout function, if applicable.

ACTIVE

O Line Status

If in DEFROST Mode

The unit will terminate defrost and enter HEAT MODE uncalibrated with defrost timer set for a maximum 34 minute test.

INACTIVE

If in HEATING Mode

If no ambient or coil sensor fault exist, unit will go into DEFROST MODE. If ambient or coil faults exist (open or shorted), unit will remain in HEAT MODE.

NOTE — Heat pump control cannot be force into defrost mode when the ambient temperature input from the RT13 sensor is above 65ºF (18ºC).

NOTE — If ambient or coil fault is detected, the board will not execute the TEST mode.

XP17

If jumper on TEST pins remains in place for more than five seconds.

The unit will return to HEAT MODE un−calibrated with defrost timer set for 34 minutes.

Figure 7. Test Pin (E33) Functions

Page 12

If jumper on TEST pins is removed before a maximum of five seconds.

The unit will remain in DEFROST MODE until termination on time or temperature.

Table 4. RT13 Ambient and RT21 Coil Sensors Temperature / Resistance Range

Degrees

Fahrenheit

136.3 2680 56.8 16657 21.6 44154 -11.3 123152

133.1 2859 56.0 16973 21.0 44851 -11.9 125787

130.1 3040 55.3 17293 20.5 45560 -12.6 128508

127.3 3223 54.6 17616 20.0 46281 -13.2 131320

124.7 3407 53.9 17942 19.4 47014 -13.9 134227

122.1 3592 53.2 18273 18.9 47759 -14.5 137234

119.7 3779 52.5 18607 18.4 48517 -15.2 140347

117.5 3968 51.9 18945 17.8 49289 -15.9 143571

115.3 4159 51.2 19287 17.3 50074 -16.5 146913

113.2 4351 50.5 19633 16.8 50873 -17.2 150378

111.2 4544 49.9 19982 16.3 51686 -17.9 153974

109.3 4740 49.2 20336 15.7 52514 -18.6 157708

107.4 4937 48.5 20695 15.2 53356 -19.3 161588

105.6 5136 47.9 21057 14.7 54215 -20.1 165624

103.9 5336 47.3 21424 14.1 55089 -20.8 169824

102.3 5539 46.6 21795 13.6 55979 -21.5 174200

100.6 5743 46.0 22171 13.1 56887 -22.3 178762

99.1 5949 45.4 22551 12.5 57811 -23.0 183522

97.6 6157 44.7 22936 12.0 58754 -23.8 188493

96.1 6367 44.1 23326 11.5 59715 -24.6 193691

94.7 6578 43.5 23720 11.0 60694 -25.4 199130

93.3 6792 42.9 24120 10.4 61693 -26.2 204829

92.0 7007 42.3 24525 9.9 62712 -27.0 210805

90.6 7225 41.7 24934 9.3 63752 -27.8 217080

89.4 7444 41.1 25349 8.8 64812 -28.7 223677

88.1 7666 40.5 25769 8.3 65895 -29.5 230621

86.9 7890 39.9 26195 7.7 67000 -30.4 237941

85.7 8115 39.3 26626 7.2 68128 -31.3 245667

84.5 8343 38.7 27063 6.7 69281 -32.2 253834

83.4 8573 38.1 27505 6.1 70458 -33.2 262482

82.3 8806 37.5 27954 5.6 71661 -34.1 271655

81.2 9040 37.0 28408 5.0 72890 -35.1 281400

80.1 9277 36.4 28868 4.5 74147 -36.1 291774

79.0 9516 35.8 29335 3.9 75431 -37.1 302840

78.0 9757 35.2 29808 3.4 76745 -38.2 314669

77.0 10001 34.7 30288 2.8 78090 -39.2 327343

76.0 10247 34.1 30774 2.3 79465

75.0 10496 33.5 31267 1.7 80873

74.1 10747 33.0 31766 1.2 82314

73.1 11000 32.4 32273 0.6 83790

72.2 11256 31.9 32787 0.0 85302

71.3 11515 31.3 33309 -0.5 86852

70.4 11776 30.7 33837 -1.1 88440

69.5 12040 30.2 34374 -1.7 90068

68.6 12306 29.6 34918 -2.2 91738

67.7 12575 29.1 35471 -2.8 93452

66.9 12847 28.6 36031 -3.4 95211

66.0 13122 28.0 36600 -4.0 97016

65.2 13400 27.5 37177 -4.6 98870

64.4 13681 26.9 37764 -5.2 100775

63.6 13964 26.4 38359 -5.7 102733

62.8 14251 25.8 38963 -6.3 104746

62.0 14540 25.3 39577 -6.9 106817

61.2 14833 24.8 40200 -7.5 108948

60.5 15129 24.2 40833 -8.2 11114 1

59.7 15428 23.7 41476 -8.8 113400

59.0 15730 23.2 42130 -9.4 115727

58.2 16036 22.6 42794 -10.0 118126

57.5 16345 22.1 43468 -10.6 120600

Resistance

Degrees

Fahrenheit

Resistance

Degrees

Fahrenheit

Resistance

Degrees

Fahrenheit

Resistance

XP17

Page 13

System Status, Fault and Lockout LED Codes

LED codes are displayed using various LEDs located on the heat pump control (A175). See figure 3 for locations of heat pump control LEDs.

DS11 AND DS14 — SYSTEM STATUS, FAULT AND LOCKOUT LED CODES

DS11 (Green) and DS14 (Red) LEDs indicate non-communicating mode diagnostics conditions that are listed in table 5.

These LEDs display fault conditions in unit cooling and heating capacity, dehumidification mode, anti-short cycle lockout, high and low pressures, discharge line temperature, outdoor temperature, and discharge sensor failures.

DS15 AND DS13 — COMPRESSOR FAULT AND LOCKOUT LED CODES

DS15 (Yellow) and DS13 (Red) LEDs indicate diagnostics conditions that are listed in table 6.

These LEDs display the most common compressor or compressor related fault conditions in the unit. When an abnormal condition is detected, this function communicates the specific condition through LEDs. The diagnostic function is capable of detecting both mechanical and electrical system abnormal conditions.

IMPORTANT

DS15 and DS13 compressor LED fault and lockout codes do not provide safety protection. The is a monitoring function only and cannot control or shut down other devices.

RESETTING FAULT AND LOCKOUT LED CODES

All LED fault and lockout codes can be reset manually or automatically:

1. Manual Reset

Manual reset can be achieve by one of the following methods:

 Disconnecting R wire from the heat pump's R

terminal.

 Turning the indoor unit off an on again

After power up, existing code will display for 60 seconds and then clear.

2. Automatic Reset

After a fault or lockout is detected, the heat pump control continues to monitor the unit's system and compressor operations. When/if conditions return to normal, the alert code is turned off automatically.

Table 5. System Status, Fault and Lockout LED Codes and Related iComfortt-Enabled Thermostat Alert Codes

System fault and lockout LED (DS11 / DS14) alarm codes takes precedence over system status LED codes (cooling, heating stages or defrost/dehumidification). Only the latest active LED fault or lockout alarm code if present will be displayed. If no fault or lockout codes are active, then system status LEDs are routinely displayed. See notes 1 and 2 in table below for duration of fast / slow flashes and pause.

Heat Pump Control

LEDs

DS11

Green

Off Off

Simultaneous slow flash

Alternating slow flash

Simultaneous fast

DS14 Red

flashes

iComfortt

-enabled

Thermostat

Display

Not

applicable

Not

applicable

Not

applicable

Moderate /

Critical Alert

Code 180

Condition Possible Cause(s) Solution

SYSTEM STATUS

1. No power (24V) to heat pump control terminal's R and C or

Power problem

Normal operation Unit operating normally or in standby mode.

5-minute

anti-short cycle

delay

Ambient sensor

problem

heat pump control failure.

2. Heat pump control failure.

Initial power up, safety trip, end of room thermostat de mand.

If sensor detects an open, shorted or out-of-temperature range. heat pump control will revert to time/temperature defrost operation. System will still heat or cool.

Check control transformer power (24V).

If power is available to control and LED(s) do not light, replace the heat pump control.

None required (Jumper FIELD TEST (E33) pins to override)

Alternating fast flash

On On

Moderate /

Critical Alert

Code 417

Not

applicable

Coil sensor

Heat pump

control failure

XP17

problem

If the outdoor coil temperature sensor is detected as being open or shorted, the heat pump control will not perform defrost operations.

Indicates that heat pump control has an internal component failure. Cycle 24 volt power to heat pump control. If code does not clear, replace the heat pump control.

Page 14

Heat Pump Control

LEDs

DS11

Green

DS14 Red

1 fast flash

Off

then

pause

iComfortt

-enabled

Thermostat

Display

Not

applicable

Single stage compressor

heating

SolutionPossible Cause(s)Condition

1 fast flash

then

pause

2 fast

flashes

then

pause

None

2 fast

flashes

then

pause

Off

Not

applicable

Not

applicable

Not

applicable

Moderate

Alert Code

105

Moderate

Alert Code

120

Critical Alert

Code 124

Defrost

Single-stage

compressor

cooling

Dehumidification

mode

Device

communication

failure

Unresponsive

device

Active subnet

controller missing

These are codes that show status of operation whether the system is operating in either in first or second stage heating or cooling operation, defrost or in the dehumidification modes.

ALERT STATUS

iComfort-enabled thermostat is unable to communicate with any other device on the RSBus. Alarm only occurs if a specific device did communicate initially after power up and communication was later lost. Possible causes are lost connection, bus short or open, or other device stop responding.

Message could be sent by any device on RSBus if expected response message is not received from other device. If sent by indoor or heat pump control, device did not get expected response (incorrect or no response at all) from active Subnet controller. If sent by the iiComfort-enabled

thermostat, and did not get the

expected response (incorrect or no response at all) from device. Normally this indicate device malfunction.

Device lost connection to iComfort-enabled thermostat is sending heartbeat message in one minute intervals. Device sets this alarm if no Heartbeat is received for three minutes. Normally this indicate lost connection to thermostat, or thermostat is not working. Alert will clear after valid subnet controller message is received.

None

Off

Slow flash

Off On

Slow flash Off

On Off

Critical Alert

Code 125

Moderate /

Critical Alert

Code 126

Critical Alert

Code 131

Critical Alert

Code 132

Moderate

Alert Code

410

Critical Alert

Code 411

Moderate

Alert Code

412

Critical Alert

Code 413

Hardware Failure

Internal control

communication

failure

Corrupted control

parameters

Failed flash CRC

check.

Low pressure

fault

Low pressure

switch lockout

High pressure

fault

High pressure switch lockout

Entire or partial system failure. Alert will clear 300 seconds after fault has recovered.

Internal communication on heat pump control. Alert will clear 300 seconds after fault has recovered.

System stored configuration data is corrupted. System will not run.

No operations, heat pump control enters boot loader mode. Alarm will clears after reset. Refer to communicating thermostat for memory corrupt handling.

Restricted air flow over in door or outdoor coil.

Improper refrigerant charge in system.

Improper metering device installed or incorrect op eration of metering device.

Incorrect or improper sen sor location or connection to system.

Remove any blockages or restrictions from coils and/or fans. Check indoor and outdoor fan motor for proper current draws.

Check system charge using approach and sub cooling temperatures.

Check system operating pressures and compare to unit charging charts.

Make sure all pressure switches and sensors have secure connections to system to prevent refrigerant leaks or errors in pressure and temper ature measurements.

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Page 15

Heat Pump Control

LEDs

DS11

Green

DS14 Red

Slow flash On

Fast flash On

iComfortt

-enabled

Thermostat

Display

Moderate

Alert Code

414

Critical Alert

Code 415

Discharge line

temperature fault

Discharge line

temperature

lockout

SolutionPossible Cause(s)Condition

This code indicates high discharge temperatures. If the discharge line temperature exceeds a temperature of 279ºF (137ºC) during compressor operation, the control will de-energize the compressor contactor output (and the defrost output if active). The compressor will remain off until the discharge temperature has dropped below 225ºF (107ºC).

Off Fast flash

Moderate /

Critical Alert

Code 417

Discharge sensor

fault

The heat pump control (A175) detects open or short sensor or out of temperature sensor range. This fault is detected by allowing the unit to run for 90 seconds before checking sensor resistance. If the sensor resistance is not within range after 90 seconds, the control will raise the alarm.

3 fast

flashes

then

pause

3 fast

flashes

then

pause

Off

Moderate /

Critical Alert

Code 418

Moderate /

Critical Alert

Code 419

W output

hardware fault

W output

hardware fault

lockout

When auxiliary heat output is detected as active. Fault in the heat pump control. Replace heat pump control.

If heat pump control recognizes five output hardware fault events during a single cooling demand, the heat pump control will initiate a lockout.

3 fast

Off

flashes

then

Critical Alert

Code 421

W external

miswire fault

When auxiliary heat output is detected as active after compressor has been de-energized.

pause

Simultaneous fast

None

flashes then pause

Fast simultaneous flashing of DS11,

Second-stage

heat lock-in

OEM mode Factory test mode.

If the unit is in non-communicating mode and it goes to second stage due to ambi ent temperature being below second stage lock-in setting (E48).

DS13, DS14 and DS15

1. Pause duration is two (2) seconds.

2. Fast flash duration is 1/2 second. Slow flash duration is one (1) second.

Table 6. Compressor Fault and Lockout LED Codes and Related iComfortt-Enabled Thermostat Alert Codes

NOTE — See notes 1 and 2 in table below for duration of fast / slow flashes and pause.

Heat Pump Control

LEDs

DS15 Yellow

DS13

Red

Off On

iComfortt

-enabled

Thermostat

Display

Moderate/

Critical

Alert

Code 400

Condition

Compressor

internal

overload trip

Possible Cause(s)

Thermostat demand signal Y1 is present, but compressor not running

Solution

Compressor protector is open.

 Check for high head pressure  Check compressor supply voltage

Outdoor unit power disconnect is open.

Compressor circuit breaker or fuse(s) is open.

Broken wire or connector is not making contact.

Low or high pressure switch open if present in the system.

Compressor contactor has failed to close.

Clearing Sta tus

Clears the error after current is sensed in the run and start winding for two seconds, ser vice removed or power reset.

XP17

Page 16

Heat Pump Control

LEDs

DS15 Yellow

DS13

Red

1 flash then

Off

pause

2 flashes then

Off

pause

iComfortt

-enabled

Thermostat

Display

Critical Alert

Code 401

Critical Alert

Code 402

Condition

Long run

time.

System

pressure trip

Possible

Possible Cause(s)

Cause(s)

Compressor is running extreme ly long run cycles.

Indicates the compressor protector is open or missing supply power to the compressor.

Solution

Low refrigerant charge.

Evaporator blower is not running.

 Check blower relay coil and contacts  Check blower motor capacitor  Check blower motor for failure or blockage  Check evaporator blower wiring and connec

tors

 Check indoor blower control  Check thermostat wiring for open circuit

Evaporator coil is frozen.

 Check for low suction pressure  Check for excessively low thermostat setting  Check evaporator airflow (coil blockages or re

turn air filter)

 Check ductwork or registers for blockage.

Faulty metering device.

 Check TXV bulb installation (size, location and

contact)

 Check if TXV/fixed orifice is stuck closed or de

fective

Condenser coil is dirty

Liquid line restriction (filter drier blocked if pres

ent)

Thermostat is malfunctioning

 Check thermostat sub-base or wiring for short

circuit

 Check thermostat installation (location and

level)

High head pressure.

 Check high pressure switch if present in sys

tem

 Check if system is overcharged with refriger

ant

 Check for non-condensable in system

Condenser coil poor air circulation (dirty, blocked, damaged).

Condenser fan is not running.

 Check fan capacitor  Check fan wiring and connectors  Check fan motor for failure or blockage

Return air duct has substantial leakage.

Clearing Sta

Clearing Sta tus

tus

Clears the error after 30 consec utive normal run cycles, or after power reset.

Clears after four consecutive normal com pressor run cycles, or after power reset.

3 flashes then pause

4 flashes then pause

Off

Moderate

Alert Code

403

Critical Alert

Code 404

Short cycling

Locked rotor

XP17

Compressor is running less than three minutes.

Compressor has a locked out due to run capacitor short, bearings are seized, excessive liquid refrigerant.

Page 17

Thermostat demand signal is intermittent.

Time delay relay or heat pump control is defec tive.

If high pressure switch is present, see flash code 2 information.

Run capacitor has failed.

Low line voltage (contact utility if voltage at disconnect is low).

 Check wiring connections

Excessive liquid refrigerant in the compressor.

Compressor bearings are seized.

Clears after four consecutive normal com pressor run cycles, or after power reset.

Clears after power reset or four normal compressor cycles.

Heat Pump Control

LEDs

DS15 Yellow

DS13

Red

5 flashes then

Off

pause

6 flashes then

Off

pause

7 flashes then

Off

pause

iComfortt

-enabled

Thermostat

Display

Critical Alert

Code 405

Critical Alert

Code 406

Critical Alert

Code 407

Condition

Open circuit

Open start

circuit

Open run

circuit

Possible

Possible Cause(s)

Cause(s)

Compressor has an open circuit due to power dis connection, fuse is open or other similar condi tions.

Current not sensed by Start transformer.

Current not sensed by run transformer.

Solution

Outdoor unit power disconnect is open.

Unit circuit breaker or fuse(s) is open.

Unit contactor has failed to close.

 Check compressor contactor wiring and

connectors

 Check for compressor contactor failure

(burned, pitted or open)

 Check wiring and connectors between supply

and compressor

 Check for low pilot voltage at compressor

contactor coil

High pressure switch is open and requires manual reset.

Open circuit in compressor supply wiring or connections.

Unusually long compressor protector reset time due to extreme ambient temperature.

Compressor windings are damaged.

 Check compressor motor winding resistance

Run capacitor has failed.

Open circuit in compressor start wiring or connections.

 Check wiring and connectors between supply

and the compressor S terminal

Compressor start winding is damaged.

 Check compressor motor winding resistance

Open circuit in compressor start wiring or connections.

 Check wiring and connectors between supply

and the compressor R terminal

Compressor start winding is damaged.

 Check compressor motor winding resistance

Clearing Sta

Clearing Sta tus

tus

Clears after one normal com pressor run cycle or power reset.

Clears when amperage is de tected in RUN and START sensors, or af ter power reset.

8 flashes then pause

9 flashes then pause

Off

Critical Alert

Code 408

Moderate/

Critical Alert

Code 409

Fast simultaneous flashing of DS11,

Welded

contactor

Secondary

low voltage

Compressor always runs

24VAC is below 18VAC.

OEM Mode Factory test mode.

Compressor contactor failed to open.

Thermostat demand signal not connected to module.

Control circuit transformer is overloaded.

Low line voltage (contact utility if voltage at disconnect is low).

 Check wiring connections

DS13, DS14 and DS15

1. Pause duration is two (2) seconds.

2. Fast flash duration is 1/2 second. Slow flash duration is one (1) second.

3. Initially a moderate status is displayed and is escalated to critical if alarm exists for more than 10 minutes.

Clears after one normal com pressor run cycle or after power reset.

Clears after voltage is high er than 20VAC for two sec onds, or after power reset.

XP17

Page 18

Component Field Configuration and Troubleshooting

FAN MOTOR CONTROL (A177)

This section provides procedures for testing the fan control.

FAN MOTOR CONTROL LED CODES AND SEQUENCE OF OPERATIONS

During start up, the LED:

1. Display error conditions (see table 9), if present

2. If no errors are detected, then the LED code indicating stage operation (see table 10) will display the applicable code and then a long pause.

3. The fan motor speed / RPM (revolutions per minute) indicator is displayed next (see table 8).

4. After the RPM indicator is displayed, there is a short pause. The sequence repeats if a thermostat demand is still present. See figure 8 for LED sequence. See table 10 for description of flash and pause durations.

FAN MOTOR CONTROL TROUBLESHOOTING

Use the following subsections to verify and test the fan motor control (A177).

Verifying Jumper Settings (J2)

The unit is shipped from the factory with the default fan motor speed setting (in RPMs) required for each specific model. Use the table 8 verify that jumpers are set correctly for the specific unit.

Verifying LED Status Codes

During start up, the fan motor control (A177) LED will display any error conditions. If error conditions exist then no other codes will display. If no error conditions are present, then the stage status and and RPM indicator are displayed. Fan motor speeds

are not adjustable for a single stage outdoor unit (see table 8).

Verifying Correct DC Output Voltage (J2)

The following three methods can be used to determine whether the fan motor (B4) is operating at the correct RPMs based on unit size.

1. Use the information provided in table 8 to verify that all four jumper terminals are set correctly for the specific size unit.

2. Verify LED RPM indicator is displaying the correct flash sequence for the applicable size unit (see table 10).

3. Test DC voltage output on the fan motor control's J2 terminals (see figure 9) while under full load and verify the voltage read to the voltage listed in table 8 for the applicable size unit.

4. If no voltage is detected at the J2 terminals, verify there is a Y1 demand at the thermostat and applicable voltages detected all fan motor control (A177) voltage inputs, see table 7.

If there is a demand, proceed to the next section for further testing.

Verifying Correct Input Voltage (ECM/Y1,

ECM/Y2, ECM C and EXT ECM/R)

Using a voltmeter, check voltages on the following fan motor control inputs using table 7. Voltage will only be present during a thermostat demand. See figure 10 for test example.

If correct voltages are detected at applicable inputs during a demand, and no voltage is present at the J2 terminals, then fan motor control should be replaced.

Table 7. Fan Motor Control Voltage Inputs

Input

ECM/Y1 and ECM C

EXT ECM/R and ECM C

Call for Cooling

YES

NO NONE

YES 24VAC

NO NONE

Voltage Present

Between 24VDC and 32 VDC

XP17

Page 19

Table 8. One Stage — Fan Motor Control RPM Jumper Settings, LED RPM Indicator and P2 DC

Voltage Outputs

Model LED Code*

4 3 2 1 RPM (J2) DC Volt

XP17-024 5 OFF ON ON ON 400 12.7

XP17-030 6 OFF ON ON OFF 450 14.3

XP17-036, -042 8 OFF OFF ON ON 600 19.2

XP17-048, -060 9 OFF OFF OFF ON 675 21.6

* LED Code indicates fan motor control LED flash sequence. For example, LED Code 9 indicates 9 slow flashes and pause.

CFM Profile Pin Select ECM1/Y1

Table 9. Fan Motor Control Error/Fault LED Codes

Unit Status Fan Motor Control LED Possible Cause

Mismatched RPM Fast Flash with no pause

Internal feedback, PWM does not match target.

CRC Failure Constant ON. Microcontroller CRC failure.

Table 10. Fan Motor Control (A177) Unit LED Codes

Unit Status Unit Status Fan Motor Control LED

One Stage Operation Low Stage — ECM1/Y1 ONLY One slow flash, then short pause.

RPM Indicator

NOTE — There is a long pause between stage operation and RPM indicator. See tables 1 and 2 for LED RPM indicator.

Flash Flash = Three flashes per second.

Slow Flash = One flash per second.

Short Pause = Two seconds of OFF time.

Long Pause = Five seconds of OFF time.

RPM Indicator

Appropriate number of flashes (See tables 8 and 2).

YES

DEMAND

BEGINS

MISMATCHED

RPM

CRC FAILURE

SINGLE STAGE

OR EDA

OPERATION

DEMAND

ENDED

MOTOR SPEED

ECM1/Y1

ONLY OR

ECM2/Y2

ONLY

DEFAULT FAN

MOTOR SPEED

USED

DEFAULT FAN

USED

FAN MOTOR

RPM SET PER

JUMPER

SETTINGS

LED CONTINUOUS FAST

FLASH

LED CONSTANT ON

STAGE LED INDICATOR: ONE SLOW FLASH AND ONE SHORT PAUSE FOR SINGLE STAGE OR EDA OPERATION

REPLACE FAN MOTOR

CONTROL BOARD

REPLACE FAN MOTOR

CONTROL BOARD

LED RPM INDICATOR: EXAMPLE: (2−TON

UNIT) – 5 SLOW FLASHES AND ONE

LONG PAUSE

Figure 8. Fan Motor Control One Stage LED Sequence of Operation

XP17

Page 20

FAN MOTOR CONTROL (A177) —

PULSE-WIDTH MODULATION (PWM)

CFM Profile Pin Select

HEAT PUMP

CONTROL (A175)

CONTROL BOX

VERIFY DC VOLTAGE OUTPUT USING FAN PWM OUT AND COM TERMINALS. SEE TABLE 8 FOR OPTIMAL DC VOLTAGE BASED ON CFM PROFILE USED.

COM

PARK

JUMPER

OFF

JUMPER

LED

GREEN

YELLOW

RED

YELLOW

RED

YELLOW

FAN PWM OUT

HIGH PRESSURE SWITCH (S4)

HEAT PUMP CONTROL (A175)

YELLOW

BLUE

BLACK

YELLOW

FAN MOTOR

CONTROL

GREEN

RED RED

B4 FAN

MOTOR

BLACK

BROWN

SEE TABLE 8 FOR CFM PROFILE SELECTION OPTIONS.

Figure 9. Fan Motor Control, Wiring, Jumper Settings, Testing and LED Location

XP17

Page 21

FAN MOTOR CONTROL (A177) —

PULSE-WIDTH MODULATION (PWM)

CONTROL BOX

INPUT VOLTAGES DURING DEMAND

ECM/Y1 ONLY - 24VDC

HEAT PUMP

CONTROL (A175)

BLUE WIRE

BLACK WIRE

VDC

VAC

ONE YELLOW WIRE FROM PS (E24) TERMINAL ON HEAT PUMP

CONTROL (A175) AND SECOND YELLOW WIRES ON PIGGYBACK

GREEN

TERMINALS GOES TO S4 HIGH PRESSURE SWITCH.

RED

YELLOW

S4 HIGH PRESSURE SWITCH

YELLOW

YELLOW WIRE

EXT PWR/R (24VAC INPUT

DURING DEMAND ONLY)

YELLOW

BLUE

BLACK

YELLOW

FAN MOTOR

CONTROL

GREEN

RED RED

B4 FAN

MOTOR

BLACK

BROWN

SEE TABLE 8 FOR CFM PROFILE SELECTION OPTIONS.

Figure 10. Testing for External Power to Fan Motor Control

XP17

HEAT PUMP CONTROL

Page 22

Fan Motor (B4) Test Procedure

A simple test can be used to test the fan motor operation. A fully charged 9V battery will be required for this procedure.

FAN MOTOR TEST

This is a test that will verify that the motor does operate.

1. Verify main (240 volt) power if OFF to unit.

2. Remove both wires (brown and black) from the J2 terminal on the fan motor control (A177).

3. Room thermostat should be in OFF position (unit in idle mode - no heating or cooling demands)

4. Turn main power (240 volt) ON to unit.

5. Connect 9 Volt battery to fan motor (B4) plugs as noted in picture below.

6. Fan motor should run at a reduced fan speed.

7. Fan motor does not run, then replace fan motor assembly.

REMOVE BOTH LEADS

FROM J2 TERMINALS

BLACK LEAD

BROWN LEAD

COM

PARK

FAN PWM OUT

FAN MOTOR CONTROL (A177)

BLACK LEAD

CONNECT B4 FAN MOTOR BLACK

COMMON WIRE TO 9V BATTERY

NEGATIVE TERMINAL

NEGATIVE TERMINAL POSITIVE TERMINAL

BLACK LEAD

BROWN LEAD

CONNECT B4 FAN MOTOR WIRE TO 9V BATTERY POSITIVE

TERMINAL

XP17

FULLY CHARGED 9V BATTERY

Figure 11. Fan Motor (B4) Test

Page 23

TOP GRILLE OR FAN MOTOR MOUNT ADJUSTMENT FOR FAN CLEARANCE

Sometimes during shipping, either the fan motor mounting or top grille may become out of alignment. This may cause the fan motor blade to not clear the orifice ring. If this situation occurs, simply adjust either or both the fan motor mount or top grille positions to allow proper clearance. The top grille four fastener insertion points to the plastic top and motor mount locations are larger than the fasteners used to secure the grille and fan motor mounts. Use the procedures provided in figure 12 to adjust for fan clearance.

PUSH

FORWARD

GRILLE MOUNTING

POINTS

PUSH

FORWARD

FASTENER INSERTION POINT

FAN MOTOR MOUNTING POINTS

THE FOUR MOUNTING POINT HOLES THAT SECURE THE TOP GRILLE TO THE PLASTIC TOP ARE LARGER THAN THE FASTENERS USED TO SECURE THE GRILLE. THIS IS ALSO TRUE FOR THE FOUR FASTENERS SECURING THE FAN MOTOR TO THE TOP GRILLE. TO PROVIDE MORE CLEARANCE, PREFORM EITHER OR BOTH OF THE FOLLOWING PROCEDURES.

TOP GRILLE ADJUSTMENT

1. LOOSEN THE FOUR GRILLE MOUNTING FASTENERS AND PUSH THE GRILLE FORWARD. TIGHTEN MOUNTING HARDWARE. IF THERE IS STILL INSUFFICIENT CLEARANCE PROCEED TO STEP 2.

FAN MOTOR POSITION ADJUSTMENT

2. LOOSEN THE FOUR FAN MOTOR GRILLE MOUNTING FASTENERS AND PUSH THE FAN MOTOR FORWARD. TIGHTEN MOUNTING HARDWARE.

GRILLE MOUNTING POINTS

Figure 12. Fan Blade Clearance Adjustment

ORIFICE RING

XP17

Page 24

HEAT PUMP CONTROL (A175) UNIT NOMINAL CAPACITY CODE CONFIGURATION

In a communicating system, if the room thermostat is indicating either a error code 313, indoor and outdoor unit

capacity mismatch error code, or error code 34, must program unit capacity for outdoor unit. Use the procedure

provided in figure 13 to set the unit nominal capacity code.

Set room thermostat

Go to control terminal

Remove R wire

from control (24 volt

AC power)

iComfortt

-enabled —

Remove control

wires from i+ and

i- terminals

START

to OFF

strip

Non - iComfortt

enabled —

Remove control

wire from Y1

terminal

DS14 (Red)

DS11 (Green)

Field Test

(E33)

DS12 Communicating Status Indicator

Sensor harness must be attached to air conditioner control.

TERMINAL STRIP

FINISH

Connect R wire to

control (24 volt AC

power)

Reconnect any control

wiring previously

removed.

Remove R wire from

air conditioner control

(24 volt AC power)

Place jumper

on FIELD TEST

(E33 pins)

Connect R wire to control

(24 volt AC power)

Status LED lights DS11 and DS14 will blink and then on continuously. Once both LEDs are on continuously then remove jumper immediately from E33.

If jumper is not removed immediately from E33, then DS11 and DS14 LEDs will resume blinking again.

YES

successfully

Remove R wire

from control (24 volt

AC power)

Jumper

removed

Place jumper on FIELD

TEST (E33 pins) within 2 to

4 seconds after removal

The control’s DS11 and DS14 LEDs will start blinking the Unit Nominal Code at three (3) second intervals starting at 1-ton through to 6-ton. If a code is not selected, the control will cycle one more time through the codes before defaulting back to the idle mode (simultaneous slow flash).

Long blink ON red LED (DS14) to indicate tonnage and solid ON green LED (DS11) to indicate ½ tonnage.

When the required Unit Capacity Code is displaying on the LEDs, remove FIELD TEST jumper from pins (E33). LEDs will continue to display the selected unit capacity code for two (2) minutes before defaulting back to the idle mode {simultaneous slow flash}, or until the 24 volt

power is cycled to the air conditioner control.

Model

-012

-018

-024

-030

-036

-042

-048

-054

-060

-066

-072

Size

1-ton

1.5-ton

2-ton

2.5-ton

3-ton

3.5-ton

4-ton

4.5-ton

5-ton

5.5-ton

6.0-ton

DS11 Green LED

OFF

DS14 Red LED

1 long flash

2 long flashes

3 long flashes

4 long flashes

5 long flashes

6 long flashes

Figure 13. Heat Pump Control (A175) Unit Nominal Capacity Code Configuration

XP17

Page 25

+ 58 hidden pages

Lennox XP17-024-230-07, XP17-024-230-03, XP17-030-230-01, XP17-030-230-02, XP17-024-230-04 Installation And Service Procedure

Specifications and Main Features

Frequently Asked Questions

User Manual